Count number of Divs filtering on id/class

Question

Hiii,
Q-> I want to count the number of div in a page whose id start with d

<div id="d1">D1</div>
<div id="d2">D2</div>
<div id="d3">D3</div>

I want to get 3 here

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Q-> I want to count the number of div in a page which have the class d

<div class="d">D1</div>
<div class="d">D2</div>

I want to get 2 here

Answer 1

For the first one you just need a "starts with selector"

$('div[id^=d]').length

And the second is just a standard class selector:

$('div.d').length

The $() function call returns an array of matching elements so once you have it, you just need to look at the length property to find out how many matches there are.